How did the United States react to German u-boats attack’s?

Answer/Explanation

At the end of January 1917, Germany, determined to win its war of attrition against the Allies, announced the resumption of unrestricted warfare. Three days later, the United States broke off diplomatic relations with Germany; just hours after that, the American liner Housatonic was sunk by a German U-boat.

Please vote Brainliest

yes.

explanation:

because it let the japanese know who had the upper hand in the war.